Liquid-fuel burner



B. sl-:ABoLp-r LIQUID FUEL BURNER www 2 Sheets-Sheet. 1

f on the linea-5 of Figure 1.Y

Patented Feb. 5, 1929.

PATENT OFFICE.

BERT sEaBoLDT, oF NEW YORK, N. Y.

LIQUvIn-FUEL BURNER.

-. Application mea` march 12, y19ers. serial No. 14,862.

Y Thisinvention relates to liquid fuel burners and has for its'object to provide a burner which will utilizethe velocity of the atom-y izing agent, as well as the velocity of. the liquid fuel in securing a high degree offineness of atonnzation 1n the spray, 1n order to produce complete combustion; to increase ef ficiency; and to reduce the consumption kof they atomizing agent. i

Vith theseandother objects in View, the l' invention consists of the novel details of kconstruction and combinations of parts more fully hereinafter' disclosed and particularly pointed out in the claim. n Y n,

The invention consists of the novel construction hereinafter describedand finally claimed. l

The nature, characteristic features and scope of the invention will bevmore-fully understood fromk -the following description taken in connection with the accompanying drawings forming part hereof, and in which:

Fig. 1, is a View in longitudinal section of a burner embodying the invention. v

Fig..2, is a fragmentary view in central section illustrating a slightly modified form. Fig. 3, is a fragmentary view in'section, .showing a slightly ment;

Fig. 4, is a view in cross-sectiontaken upon the. line .if-fof Fig. 3, and

Figure 5 is a cross sectional view as seen j Forthe purpose ofv 'Ilustratm'g invention I have shown in theaccompanying drawings two forms thereof which lareat present. preferred by me since the same have been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities. of which my invention consists can be yvariously arranged and organized and that my invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

Referring'to the drawings in detail, the reference numeral 1, designates asource of air supply fitted to a head 2 having a horizontally` extended, exteriorly screw-threaded neck 3. Extending? through the head and neck is an angular passage 4 the outlet end of which is tapped to receive the screwthreaded end of a central, longitudinally extended air pipe 5. Also connected with head 2 is an oil supply pipe 6. This pipe is in communication with an. angularpassage 7 fend of neck 3.

different nozzle arrangethe outer end of kwhich parallelspassage 4t and communicates with a chamber 8 in neck '3. Fitted to the outer endof neck 3 is a pipe lQ'Whicli surrounds airpipe, a coupling comprising members 10 and 11 being employed for attaching the screw-threaded f end of pipe'9 with respect to screw-threaded l Within the space formed between the outer wall of pipe '5 and the inner wall ofrpipe 9 are a plurality of spaced discs 12 arranged concentrically with respect `to pipes 5 and 9. yThe discs may be regularly spaced and are Vmutilated as at 1 3 for the pas.- sa-ge of oil. Y Y

Referring now to right handend of Fig.

1, a description will be given of the nozzle for creating a mixture of oil and air forV atomization prior to Adelivery for combustion. The air pipe 5 has screw-threaded to its outer end an inner nozzle r15 adapted for lon-y gitudinal adjustment. The outer end thereof is provided with-anfelongated`very minute orifice 16. Surroundingthe inner nozzle'is an outer nozzle `17 having a bevelled inner Wall 18 and an elongatedY orifice .19 arranged for alignment with orifice 16. The nozzle 1.7 is connected'to the oil pipe by` means of a coupling 2O and is normally maintained Iin fixed position with its bevelled, inner wall 1n juxtaposed relation to the end Iof the inner nozzle. VAny adjustment desired is secured by entirely removing the'outer nozzle and moving the inner "nozzle either toward or' away from the endof the air pipe to increase 'or decrease the distance betweentlie inner nozzle and the said bevelledr inner wall of the-outernozzle when the latter is replaced.

A'Pampering with the `inner nozzle by unauthorized `persons is thus made rather dif'- icult. It is'thus apparent that the oil in its divided state mixes with the air in the y atomizing chamber 21r priorto delivery and ignition. n i

n The purpose of this adjustment to increase or decrease the distancebetween the inner nozzle and the said bevelled inner wall of vthe outer nozzle and to establish the exact relation between these two members so that the volume and velocity of air emerging from ow of oil or liquid fuel direct from the 1 fuel supply tank, which must always be below the level of the burner, `that can be thoroughly atomized and-mixed with the proper amount of` air that will supply the correct proportion of oxygen to produce complete combustion. This adjustment produces an automatic governor so that irrespective of the air pressure, which may be from one pound up, the correct and exact amount of oil will be introduced into the mixing chamber, thereby maintaining a constant and proper mixture which will produce perfectcombustion.

The relation between the diameter of the hole in the inner nozzle and the diameterof the hole in the outer nozzle is vital to both theV proper induction to flow and thorough atomizing and mixing of the oil with the air before emission from the outer nozzle and the absolut-e, complete combustion of this mixture after emission from the outer nozzle.

The -distance from the lforward end of the inner nozzle to the said bevelle'd inner wall of the outer nozzle is also vital. The taper of the outside of the inner nozzle is also important.

Interposed between the rear end of the outer nozzle 17 and the shoulder of coupling 2O is a perforated washer 31 containing a number of small holes 32 through which the oil must pass thereby more thoroughly breaking up and atomizing the oil preparatory to mixture with the air.

In Figs. 3 and i vertically disposed nozzles are provided. rlhe oil pipe 9 carries a head 24 into which is screwed said oil pipe. The upper part of this head carries the inner nozzle 25 and the outer nozzle 26 the same adjustable relation of parts being common to them as in the horizontal type before described. Arranged within the head 24 is an angular passage 27 in communication with the air pipe and inner nozzle. Also arranged in the head 2- are a pair of passages 28-29 in communication with the oil pipe and the outer nozzle. Either type of nozzle is applicable to a burner having the discs or spiral spring shown in Figs. 1 and 2 respectively. The orilice'construction and bevelled inner wall of the outer nozzle are the same as previously described. Between the inner end of nozzle 26 and 'the head is a perforated disc 30 similar to disc 21,V the operation being the same. In forming my novel liquid fuel burner the orifice of the inner nozzle and the orifice of the outer nozzle have a pre-determined and constant ratio, and the inner nozzle has predetermined and lined relation with respect to the innerbevelled surface of the outer nozzle. The orifice of the inner nozzle is smaller than the orifice of the outer nozzle, and the diameters of these orifices are determined as follows: The selected diameter of the larger or outer orifice is divided by the common divisor 1.552, which gives the desired diameter of the orilice of the inner noz zle. rIhe distance between the free end of the inner nozzle and the inner beveled surface of the outer nozzle is substantially less than the diameter of the orifice of the outer nozzle as is clearly shown in the drawing. In a preferred form, this distance is yone-halfthe differencel between the diameters of the orifices of said nozzles. i i.

It will now be apparent that I have devised novel and useful constructions which embody spirit or scope of the invention or sacrificing any of its advantages.

lWhat I claim is In a liquid fuel burner, the lcombination of an imperforate liquid fuel tube, an imperforate air tube ooncentrically arranged witliinthe first-mentioned tube, an inner nozzle and an outer concentrate nozzle, means securing said inner and outer nozzles to said inner and outer tubes respectively and establisl tive nozzles and tubes, said outer nozzle having an Velongated cylindrical bore terminating in a tapering bore immediately in advance of its discharge orifice, the discharge ding communication between said respec-l orifices of said nozzles being in axial alignment and of substantial axial extent, the ori` fice of the outer nozzle having av diameter substantially 1.5 tnnes the diameter of the orifice of the inner nozzle, the free end of the inner nozzle being spaced from the wall of the tapering bore of the out-er nozzle a distance substantially less than the diameter of the orifice of the outer nozzle, said means for establishing communication betweenV the `outer tube and cylindrical bore of the outer nozzle comprising a plurality of'passages whose total cross-sectional area is less Vthan that of the annular space between the free end of said inner nozzle and said tapering bore.

In testimony whereof, I have hereunto signed my name.

BERT SEABOLDT. 

